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hey if you come to a point where where your current pack cannot be fixed do to the pitting let me know. i might be able to help.

Altho plausible that wouldn't explain why releasing pressure at the air-pack would free them entirely. Also it's unlikely that all three main rubber lines would simultaneously fail.

then your air pack is binding. remove and replace or rebuild. id check those two issues as mentioned in the TM first. also look for debris in the air-pack. mine was full of crud. i know you replaced most of the system but if there was anything left in there it could have gotten somewhere it...

when you say fluid line do you mean the brake line leading from the air-pack to the wheels?

effecting them fist is expected but ultimately if they all bind then the problem is upstream. once they lock if you open the brake bleeder on the air-pack do they release?

i might suggest you remove the screw at the back of the air-pack (older style long canister) or the tube that connects to the back to double check if that releases any air, if so do the brakes free? i say this because the glad hand line could (doubt it but..) be blocked somehow. its always worth...

ok forgive me if you answered this already, is your petal stiff? or is it still free to pump? that is while the brakes are locked.

in my experience when the brakes lock like this you can easily test if the air pack is holding pressure by opening the glad hand valve at the rear of the truck (driver side). if this immediately frees the brakes than your air-pack is at fault. start the truck, build air and pump the brakes...